MDB Ventures Preoctal Radio Vacuum Tubes


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Don't see what you need? Contact us. We have many more tubes that are not yet listed. We also have new and good used tubes in most other numbers including preoctal, globe/balloon, octal, loctal/loktal, miniature, subminature, metal, power, transmitter tubes and many more.

MDB Ventures Preoctal Tubes
Qty
Avail
Tube
Type
Price
Each
Tube
Brand
Emission
Strength
Mutual
Conduct

Desc

Notes
1 56S $25.00 National Union 130% 2200 / 1450Gm ST - NOS (ob> factory installed Goat shield - torn box flaps
1 56 $20.00 Raytheon 130% 1750 / 1450Gm ST - NOS (wb) engraved base - four pillar tube - label missing
1 56 $20.00 Raytheon 100% 1450 / 1450Gm ST - used (wb) engraved base - four pillar tube - label missing
1 56 $10.00 RCA / Cunningham 110% 1650 / 1450Gm ST - NOS (wb) engraved base
1 56 $10.00 RCA / Cunningham 115% 1650 / 1450Gm ST - NOS (wb) engraved base
1 56 $10.00 Zenith 110% 1650 / 1450Gm ST - NOS (wb) engraved base
1 56 $10.00 Zenith 120% 1700 / 1450Gm ST - NOS (wb) engraved base
1 56 $10.00 National Union 130% 1950 / 1450Gm ST - NOS (wb) engraved base
1 56 $10.00 National Union 110% 1800 / 1450Gm ST - NOS (wb) engraved base
1 56 $10.00 Sylvania 125% 1800 / 1450Gm ST - NOS (wb) engraved base
1 56 $10.00 Triad 150% 2350 / 1450Gm ST - NOS (wb) engraved base
1 56 $9.00 Raytheon 130% 1750 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Raytheon 140% 2250 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 RCA 115% 1650 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 RCA 120% 1700 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 RCA 120% 1600 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 RCA 120% 1750 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 RCA 110% 1600 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 RCA Radiotron 140% 2000 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 RCA Radiotron 110% 1700 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 RCA / Cunningham 110% 1650 / 1450Gm ST - NOS (OB) sealed in box - test flaps opened
1 56 $9.00 National Union 115% 1800 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 National Union 110% 1850 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 National Union 120% 1750 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Admiral 140% 1800 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Sylvania 120% 2000 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Sylvania 110% 1500 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Sylvania 140% 1900 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Sylvania 120% 1650 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Sylvania 110% 1550 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Sylvania 110% 1950 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Philco 120% 1750 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Philco 120% 1700 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Philco 110% 1600 / 1450Gm ST - NOS (wb) ---
1 56 $9.00 Wards Super Airline 120% 1700 / 1450Gm ST - NOS (wb) ---
1 56 $6.00 Sylvania 110% 1550 / 1450Gm ST - used (rb) engraved base
1 56 $6.00 Sylvania 120% 1750 / 1450Gm ST - used (rb) engraved base
1 56 $6.00 Sylvania 120% 1750 / 1450Gm ST - used (rb) engraved base
1 56 $6.00 Triad 115% 1800 / 1450Gm ST - used (L) engraved base
1 56 $5.00 Triad 120% 2000 / 1450Gm ST - used (L) engraved base
1 56 $6.00 National Union 110% 1650 / 1450Gm ST - used (L) engraved base
1 56 $6.00 National Union 120% 1000 / 1450Gm ST - used (L) engraved base
1 56 $6.00 National Union 115% 1700 / 1450Gm ST - used (L) engraved base
1 56 $6.00 National Union 110% 2050 / 1450Gm ST - used (L) engraved base
1 56 $6.00 National Union 120% 1850 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Tung-Sol 140% 2000 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Tung-Sol 140% 2000 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Tung-Sol 140% 2000 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Tung-Sol 110% 1350 / 1450Gm ST - used (L) engraved base
1 56 $5.00 Ceco 110% 1650 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Sylvania 115% 1900 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Sylvania 120% 1800 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Ken-Rad 110% 2000 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Arcturus 140% 2000 / 1450Gm ST - used (L) engraved base
1 56 $6.00 RCA / Cunningham 110% 1650 / 1450Gm ST - used (L) engraved base
1 56 $6.00 RCA / Cunningham 120% 1750 / 1450Gm ST - used (L) engraved base
1 56 $6.00 RCA / Cunningham 120% 1600 / 1450Gm ST - used (L) engraved base
1 56 $6.00 RCA / Cunningham 110% 1600 / 1450Gm ST - used (L) engraved base
1 56 $6.00 RCA / Cunningham 110% 1900 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Zenith 115% 1900 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Zenith 110% 2000 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Zenith 130% 1700 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Zenith 125% 1950 / 1450Gm ST - used (L) engraved base
1 56 $6.00 Lafayette 110% 1950 / 1450Gm ST - used (L) engraved base
1 56 $5.00 Sylvania 120% 1750 / 1450Gm ST - used (rb) ---
1 56 $5.00 Sylvania 120% 1750 / 1450Gm ST - used (rb) ---
1 56 $5.00 Sylvania 130% 1700 / 1450Gm ST - used (rb) ---
1 56 $5.00 Raytheon 120% 1050 / 1450Gm ST - used (rb) ---
1 56 $5.00 Raytheon 110% 1850 / 1450Gm ST - used (rb) ---
1 56 $5.00 Arcturus 110% 1650 / 1450Gm ST - used (rb) ---
1 56 $5.00 Triad 120% 1450 / 1450Gm ST - used (rb) ---
1 56 $5.00 Lafayette 100% 1450 / 1450Gm ST - used (rb) ---
1 56 $5.00 Ken-Rad 140% 2000 / 1450Gm ST - used (rb) ---
1 56 $5.00 National Union 115% 1700 / 1450Gm ST - used (rb) ---
1 56 $5.00 National Union 100% 1450 / 1450Gm ST - used (rb) ---
1 56 $5.00 Tung-Sol 140% 2150 / 1450Gm ST - used (ob) damaged box
1 56 $5.00 RCA / Cunningham 110% 1550 / 1450Gm ST - used (rb) ---
1 56 $5.00 RCA / Cunningham 120% 1800 / 1450Gm ST - used (rb) ---
1 56 $5.00 RCA 110% 1450 / 1450Gm ST - used (rb) ---
1 56 $5.00 RCA 120% 1800 / 1450Gm ST - used (rb) ---
1 56 $5.00 National Union 115% 1650 / 1450Gm ST - used (L) ---
1 56 $5.00 National Union 130% 1850 / 1450Gm ST - used (L) ---
1 56 $5.00 National Union 110% 1800 / 1450Gm ST - used (L) ---
1 56 $5.00 National Union 130% 1700 / 1450Gm ST - used (L) ---
1 56 $5.00 Wards Super Airline 140% 2200 / 1450Gm ST - used (L) ---
1 56 $5.00 Wards Super Airline 140% 2050 / 1450Gm ST - used (L) ---
1 56 $5.00 Wards Super Airline 130% 1800 / 1450Gm ST - used (L) ---
1 56 $5.00 Tung-Sol 130% 1800 / 1450Gm ST - used (L) ---
1 56 $5.00 Tung-Sol 130% 1900 / 1450Gm ST - used (L) ---
1 56 $5.00 Tung-Sol 130% 2000 / 1450Gm ST - used (L) ---
1 56 $5.00 Sylvania 125% 1850 / 1450Gm ST - used (L) ---
1 56 $5.00 Sylvania 110% 2000 / 1450Gm ST - used (L) ---
1 56 $5.00 Sylvania 130% 1900 / 1450Gm ST - used (L) (pl)
1 56 $5.00 Sylvania 120% 1750 / 1450Gm ST - used (L) ---
1 56 $5.00 Sylvania 130% 1800 / 1450Gm ST - used (L) ---
1 56 $5.00 Sylvania 115% 2000 / 1450Gm ST - used (L) ---
1 56 $5.00 Sylvania 140% 1900 / 1450Gm ST - used (L) ---
1 56 $5.00 Sylvania 120% 2000 / 1450Gm ST - used (L) ---
1 56 $5.00 Sylvania 115% 2000 / 1450Gm ST - used (L) ---
1 56 $5.00 Sylvania 115% 1700 / 1450Gm ST - used (L) ---
1 56 $5.00 Philco 115% 1550 / 1450Gm ST - used (L) ---
1 56 $5.00 Arcturus 120% 2350 / 1450Gm ST - used (L) ---
1 56 $5.00 Admiral 125% 1700 / 1450Gm ST - used (L) ---
1 56 $5.00 Delco 120% 1800 / 1450Gm ST - used (L) ---
1 56 $5.00 RCA 115% 1650 / 1450Gm ST - used (L) ---
1 56 $5.00 RCA Radiotron 110% 1700 / 1450Gm ST - used (L) ---
1 56 $5.00 RCA Victor 120% 1600 / 1450Gm ST - used (L) ---
1 56 $5.00 unknown 130% 1900 / 1450Gm ST - used (L) ---
1 56 $5.00 Ken-Rad 120% 1650 / 1450Gm ST - used (L) (pl)
1 56 $5.00 Raytheon 130% 1850 / 1450Gm ST - used (L) ---
1 56 $4.00 Wards Super Airline 140% 1950 / 1450Gm ST - used (L) engraved base - paint on tube
1 56 $4.00 Wards Super Airline 125% 1700 / 1450Gm ST - used (L) particles inside
1 56 $4.00 Sylvania 130% 1900 / 1450Gm ST - used (L) loose glass bead inside tube
1 56 $4.00 Sparton 140% 1950 / 1450Gm ST - used (L) engraved base - rattle inside
1 56 $4.00 Ken-Rad 120% 1650 / 1450Gm ST - used (L) engraved base - cracked base
1 56 $4.00 Crosley by Ken-Rad 120% 1600 / 1450Gm ST - used (L) engraved base - cracked base

Notes:
(OB) = original box, (rb) = relabeled/replacement box, (wb) = white box, (L) = loose (no box), (pl) = paper label on tube (original or third party)
(H) = tested on Hickok 539A
ST=ST Style, GT=GT Style, JAN = Military
Emission Strength = Percentage of emission measured on Eico 666 tube tester
(Emission Strength = 100% baseline reference, >80%:good, >60%:fair >40%=diode good).
Gm = Mutual conductance measured on Hickok 533 tube tester; Except (H)=tested on Hickok 539A
(Gm = measured/baseline, measured1:measured2/baseline, measured1:measured2/baseline1:baseline2).


How To Order:

Purchasing our preoctal tubes is easy.
Just send us an email indicating the tubes (including quantities) you want.
We will let you know the total price including shipping and handling.

Shipping and Handling Information

Contact MDB Ventures
sales@mdbventures.com
or
sales@fourwater.com

Due to the highly volatile nature of the tube business, all Prices are subject to change without notice.


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sales@mdbventures.com
or
sales@fourwater.com